﻿/* Copyright (c) 2011, John Cronin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the copyright holder nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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using System;
using System.Collections.Generic;
using System.Text;

namespace tysila
{
    class CallConv
    {
        public bool CallerCleansStack = true;

        public hardware_location ReturnValue;

        public List<hardware_location> Arguments;

        public int StackSpaceUsed = 0;

        public enum StackPOV { Caller, Callee };

        public ThreeAddressCode.Op CallTac;

        public delegate CallConv GetCallConv(Assembler.MethodToCompile meth, StackPOV pov, Assembler ass, ThreeAddressCode call_tac);
    }

    partial class Assembler
    {
        protected Dictionary<string, CallConv.GetCallConv> call_convs = new Dictionary<string, CallConv.GetCallConv>();

        protected abstract void arch_init_callconvs();

        protected CallConv MakeStaticCall(string call_conv, Signature.Param rettype, List<Signature.Param> paramlist, ThreeAddressCode.Op call_tac)
        {
            return call_convs[call_conv](new MethodToCompile
            {
                meth = null,
                tsig = null,
                type = null,
                msig = new Signature.Method
                {
                    CallingConvention = Signature.Method.CallConv.Default,
                    ExplicitThis = false,
                    HasThis = false,
                    GenParamCount = 0,
                    Params = paramlist,
                    ParamCount = paramlist.Count,
                    RetType = rettype
                }
            }, CallConv.StackPOV.Caller, this, new ThreeAddressCode(call_tac));
        }

        protected CallConv callconv_gcmalloc
        {
            get
            {
                return MakeStaticCall("default", new Signature.Param(BaseType_Type.I), new List<Signature.Param> { new Signature.Param(BaseType_Type.I) }, ThreeAddressCode.Op.call_i);
            }
        }

        protected CallConv callconv_throw
        {
            get
            {
                return MakeStaticCall("default", new Signature.Param(BaseType_Type.Void), new List<Signature.Param> { new Signature.Param(BaseType_Type.I) }, ThreeAddressCode.Op.call_void);
            }
        }

        protected CallConv callconv_castclassex
        {
            get
            {
                return MakeStaticCall("default", new Signature.Param(BaseType_Type.I4), new List<Signature.Param> { new Signature.Param(BaseType_Type.I), new Signature.Param(BaseType_Type.I) }, ThreeAddressCode.Op.call_i4);
            }
        }
    }
}
